Enhancing the thermoelectric properties of single and double filled p-type skutterudites synthesized by an up-scaled ball-milling process

JOURNAL OF ALLOYS AND COMPOUNDS

卷:695

Article

Prado-Gonjal, Jesus¹  Vaqueiro, Paz¹  Nuttall, Chris²  Potter, Robert²  Powell, Anthony V.¹ 

[1] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England

[2] Johnson Matthey Technol Ctr, Blounts Court Rd, Sonning Common RG4 9NH, England

关键词: Thermoelectric materials;    Inorganic materials;    Intermetallics;    Mechanical alloying;    Electrical transport;    Heat conduction;   

DOI  :  10.1016/j.jallcom.2016.11.404

来源: Elsevier

【 摘 要 】

The single and double filled p-type skutterudites Ce0.8Fe3CoSb12 and Ce0.5Yb0.5Fe3.25Co0.75Sb12 have been prepared by mechanical alloying. This offers a rapid method for the preparation of skutterudites that could be scaled up for adoption at industrial level. The large-scale samples prepared by ball-milling exhibit enhanced figures of merit ZT, compared with materials prepared by conventional solid-state reaction. At room temperature ZT is increased by ca. 19% for both single and double filled skutterudites. Maximum figures of merit, ZT = 0.68 and ZT = 0.93 are attained for Ce0.8Fe3CoSb12 at 773 K and Ce0.5Yb0.5Fe3.25Co0.75Sb12 at 823 K respectively. The improvement in thermoelectric values at room temperature may be traced to a reduction in thermal conductivity in the ball-milled samples arising from the reduced grain size. The influence of the microstructure on the thermoelectric properties, together with the stability in air and the performance of the materials after several heating and cooling cycles has been studied and are detailed in this work. The densified samples prepared by ball-milling also show a higher resistance to oxidation, which starts at 694 K for Ce0.8Fe3CoSb12 and at 783 K for Ce0.5Yb0.5Fe3.25Co0.75Sb12. (C) 2016 Elsevier B.V. All rights reserved.

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